docs: def fmt_concept(concept):
      """Format a |Concept|."""
  
      def fmt_cause_or_effect(x):  # pylint: disable=missing-docstring
          return box(indent(fmt_ria(x.ria, verbose=False, mip=True), amount=1))
  
      cause = header('MIC', fmt_cause_or_effect(concept.cause))
      effect = header('MIE', fmt_cause_or_effect(concept.effect))
      ce = side_by_side(cause, effect)
  
      mechanism = fmt_mechanism(concept.mechanism, concept.node_labels)
      title = 'Concept: Mechanism = {}, {} = {}'.format(
          mechanism, SMALL_PHI, fmt_number(concept.phi))
  
      # Only center headers for high-verbosity output
      center = config.REPR_VERBOSITY is HIGH
  
      return header(title, ce, HEADER_BAR_2, HEADER_BAR_2, center=center)